why we use star and delta connection?why we donot give the
supply directly?
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Answer Posted / abhishek goyal
We use star delta for mostly above the 10hp motors (we use
dol starter). When we connect dol starter to above 10hp
motor it will be trip because it take high current during
starting time approx 6-7 times of rated current. If we using
star delta starter it will work because in star Iph=IL and
Vl=Vph/1.732 so that in starting time it take less voltage
then delta and it torque also less and speed also less as
per electrical or practical application at that time torque
is 1/route3rd or 1/1.732 time so that current also less by
1/route3rd or 1/1.732 times. After getting speed it will
connecting into the delta position.
If directly connected with supply it will burn out or damage
of some other electrical equipment because of high
current.insulation of motor also damage or burn.
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